Lin Xinxin and Chang Xiaoyu were childhood friends and lived together on the beach in Tainan. The two children left many beautiful memories at the beach. However, because Xinxin's family moved to Taipei, the two children had to be separated. Xinxin was 6 years old and Xiaoyu was 5 years old at the time. Fifteen years later, Chang Xiaoyu met a senior named Lin Siyu at Taipei Medical University. She was sure that Lin Siyu was Lin Xinxin back then, but Siyu had no memory of her. Xiao Yu tried to help Siyu recall the memories of fifteen years ago, but Siyu felt heartbroken when he saw her. In addition, Siyu has always had the same dream for the past five years. After waking up from the dream, her heart hurts abnormally. However, he could not find the cause of the pain. When Xiaoyu was depressed, with the help of Professor Whitebeard, she got two pills that could travel through time and space. She planned to turn herself and Siyu into the children they were fifteen years ago. However, the pill was accidentally taken by a man named Ouyang Xiao. In this way, the age of the two people returned to fifteen years ago. With the help of their classmate Cindy, the two "children" went through hardships to find the cause of Siyu. Later, they found an important clue in the United States - Siyu underwent a major surgery at Seattle Hospital five years ago, and the attending doctor was Tan Shangfeng. In order to prevent his son from continuing to misbehave, Ouyang Zu detained Ouyang Xiao in a villa in Seattle. However, Ouyang Xiao unexpectedly found traces of Dr. Tan on the bookshelf of the villa. It turned out that Dr. Tan turned out to be Professor Whitebeard. When they went to look for him, he was missing. …
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